Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 2 - No. 46)
Which of the following can be determined using the cosine rule?
The length of a side when you know two sides and the included angle
The angles of a triangle when you know all three sides
The area of a triangle
The length of a side when all angles are known
Vysvětlení
The cosine rule is used to find side lengths or angles of a triangle.